As promised, this is the issue I had with the Halfords stuff. The orange and white base layers are from Halfords, sprayed and baked. I left it a few weeks, put it in a cupboard and then got it out to find it had chipped and worn. You can't see, but it also picked up some 'texture' from a plastic bag that was on top of it. pretty gutted given the hours I have into it.

I had the same problem with a Wooly Mammoth clone I sprayed sparkly green too, but I can live with that.